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Sounds like the vehicle came with towing package. There should be 2 large wires and a smaller one. The blue "should" be trailer brake feed. The other large wire, usually the black, would be 12 volt power for trailer interior lights and battery charge. The red should be a smaller wire and it is the back up light wiring to the trailer. Most trailers don't use this wire, except for brake lock out on some boat trailers with hydraulic brakes. Also see http://www.etrailer.com/faq-wiring.aspx. All of this is used for5, 7, or 6 pin plugs.

for parking brake and abs check for parking brake switch operation, for abs check with scan tool for any trouble code, for your cruise control unit check for any broken vacumm hoses on the engine, for the ac fan, check the fan motor, relay or fuse.